The hottest firefighter on TV, Severide (Taylor Kinney) has to make a decision about his future with the house amid his recovery. For advice, he goes to his dad, guest star Treat Williams, whose character on “White Collar” ended up revealing he was the biological father of Matt Bomer in that series’ season finale. Which begs the question: What is in Williams’ genes to allow him to create such perfect-looking progeny?

“Spartacus: War of the Damned” (Friday, 9 p.m., Starz)

Considering this is the final season for Spartacus (Liam McIntyre) and his merry band of scantily clad men and women, we should expect more than a couple heads to roll (literally). In fact, blood should demand a supporting-character credit in this ultraviolent series, considering it gets more screen time — slow-mo deaths allow it to artfully spray across the screen — than most of the actors. The little slave revolt that could has grown substantially in numbers and threatens to take down Rome — and it wouldn’t be Rome without Caesar, who joins the cast this season.

“Arrow” (Wednesday, 8 p.m., The CW)

There’s no more reliable source for saliva-inducing body shots than Stephen Amell’s abs in this comic-book series. But this week, they up the ante by adding a dash of cute nerdiness with guest star Seth Gabel (of the recently departed “Fringe”), who sheds his good-cop image to play a drug dealer luring Thea (Willa Holland) into his world.

“Ripper Street” (Saturday, 9 p.m., BBC America)

Anyone complaining about the violence displayed in American TV shows, as evidenced Kevin Bacon’s “The Following,” obviously hasn’t checked out the stuff they’re showing across the pond, like the new cop thriller “Ripper Street.” Set in the Victorian London, handsome Inspector Edmund Reid (Matthew Macfadyen, who looks like a displaced “Downton Abbey” character) and his rougher colleagues — Jerome Flynn (a k a Bronn from “Game of Thrones”) and Adam Rothenberg — attend to cases that could turn the steeliest stomach: last week’s premiere featured a sicko who shot early snuff films, and this week’s tackles children brainwashed into becoming killers.

“The Mentalist” (Sunday, 10 p.m., CBS)

Sure, you could watch this crime-solver for Simon Baker’s eyes alone, but this week they reunite a couple of Mama’s favorite “Homicide: Life on the Street” stars Kyle Secor and Reed Diamond (Bayliss and Kellerman, respectively). When the team investigates a case that involves both Red John and the Visualize group, Secor appears as a former member of Visualize and Diamond returns as CBI agent Ray Haffner.